JPS6123257Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is an instantaneous water heater, which later uses a running water switch to detect the number of times the faucet is opened and closed within a certain period of time, and identifies the detected pulse signal to change the hot water supply capacity and set water temperature. It concerns an instantaneous water heater.

Conventionally, in this type of instantaneous water heater, power is supplied to the pulse detection and hot water supply control circuits not only when the water switch is turned on, but also at all times. In other words, if power is supplied by turning on the water switch, the circuit may stop working when the water switch is turned off, or the number of on/off pulses may be limited. It cannot be memorized and therefore the original purpose cannot be achieved. If power is constantly supplied to this device, power consumption will increase, and the circuit itself may be damaged due to a lightning strike, for example. There were drawbacks such as the risk of failure.

In view of these drawbacks of the prior art, this invention is designed to supply power only for a period corresponding to a set time when the water flow switch is turned on.

Hereinafter, one embodiment of the instantaneous water heater according to this invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a control device for an instantaneous water heater according to this embodiment. In this figure, 1 and 2 are power supply terminals, 3 is a water flow switch contact inserted between both terminals 1 and 2, 4 is a relay coil connected in series to this contact 3, and 4a and 4b are this coil 4. Contact 4 is a relay contact that is turned on by excitation of
A is inserted into one side of the power supply line.

A control circuit 5 is provided in series with the contact 4a and houses the contact 4b, and counts the number of times the contact 4b is opened and closed, and in turn, the number of times the faucet is opened and closed for a set time _T1 . By correspondingly controlling the gas supply valve 6, the hot water supply capacity or set water temperature is changed, and by exciting the coil 7 and turning on the contact 7a, the ignition device 8 is activated. ing.

Further, numeral 9 designates a time limit circuit which is similarly provided in series with the contact 4a and short-circuits the contact 4a with the contact _9a only during a fixed time _T2 which is longer than the set time T1 when the power is turned on.

In the above configuration, the timing chart in FIG. 2 shows the state when the faucet is operated. In this example, the set time T ₁ is set to
In the case of 3 seconds, if the faucet is opened and closed twice within this time _T1 , the running water switch 3 performs an off->on->off->on operation. If the pulse signal at this time, that is, the case where the faucet is opened and closed twice within the set time _T1 , is defined as high capacity (high temperature setting), a large amount of gas will be supplied from the gas supply valve 6. Low capacity (low temperature setting) is when the faucet is opened and closed once within the set time _T1 .
If this is determined, the gas supply valve 6 is controlled to supply a small amount of gas.

At this time, the running water switch 3 is activated for the set time.
The time limit circuit 9 starts working from the moment it is turned on for the first time within T ₁ , and if the line is turned on for a certain period of time T ₂ longer than the set time T ₁ ,
Since the short-circuit contact 9a is on for 5 seconds, power continues to be supplied even if the water switch 3 is turned on or off within the set time _T1 , and the water switch 3 is turned on or off during that time, that is, the faucet is turned off. The number of times of opening and closing can be stored in the control circuit 5. When a certain period of time _T2 has elapsed since the water switch 3 was turned on for the first time, power is supplied to the control circuit 5 only from the contact 4a, and the faucet is closed and the contact 4a is turned on.
When it is turned off, its supply will be cut off. That is, power is not supplied to the control circuit 5 unless the faucet is opened next time. Therefore, unnecessary power consumption is eliminated.

In the above embodiment, the contacts 4a and 9a are inserted into only one side of the power supply line, but by inserting them into both sides as shown by the chain lines, the control circuit 5 can be completely disconnected from the power supply terminals 1 and 2. This makes it extremely advantageous against lightning strikes.

As detailed above, according to this invention, the control circuit stores the number of times the faucet is opened and closed within a set time from when the faucet is opened for the first time, and controls the hot water supply capacity, set water temperature, etc. In addition to supplying power to the control circuit when the water flow switch is turned on, there is also a timed opening/closing circuit that maintains the power supply for a longer period of time once power has been supplied to the circuit. This eliminates the need to constantly supply power to the control circuit, reducing power consumption, and has the advantage of preventing accidents caused by lightning.Moreover, it has a simple structure and can be provided easily and inexpensively. It has its features.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a control device for an instantaneous water heater to which an embodiment of this invention is applied, and FIG. 2 is a time chart explaining the operation of the same circuit. 1, 2...Power terminal, 3...Water switch, 4
...Relay coil, 4a, 4b...Contact, 5...
Control circuit, 6... Gas supply valve, 8... Ignition device, 9... Time limit circuit, 9a... Contact.

Claims (1)

[Scope of utility model registration request] A first switch that supplies power to a running water switch that detects the opening and closing of a faucet, a relay that is energized when the running water switch is activated, and a control circuit that turns on when this relay is energized and changes the hot water supply capacity. a second contact that is turned on when the relay is energized and supplies a signal indicating opening/closing of the faucet to the control circuit; and a second contact that is turned on when the relay is energized and supplies a signal indicating opening/closing of the faucet to the control circuit; and a time limit circuit that turns on a timer contact connected in parallel to the circuit for a predetermined period of time; An instantaneous water heater characterized by storing the number of opening/closing signals supplied from the second contact as the number of opening/closing times of a faucet, and controlling the hot water supply capacity according to this stored value.